Of course you should not operate the lens fully open,
because this sharpness drops sharply.
Chromatic aberration, however, is quite well available on PC
slightly out attribute.
The only thing that really bothers me somehow you lose weight from the camera,
as the area between the focus ring and aperture ring is very small and you order
rather rotate the ring and not the lens: D
I'll use it on full frame and since I can no great loss of sharpness
notice to the edge.